the shooting platforms does not necessarily slow it down. there are a few mechanics to avoid standing still to shoot a platform, like that you can instantly ground pound after a jump and at the same time as landing shoot a platform , or that you can shoot at the same time as touching a bubble to jump further. This also allows you to do high jumps on bubbles at the same time. And some gaps can even be crossed without platforms at all. Oh aand you can do a lot of jumps with just a ground pound.
sorry I did go on for so long but the game is just insanely fast when you master it. My PB is 1 minute and 41 seconds btw :)
but thank you for writing a comment, always appreciated